Dynamically create a comma separated list array based on boolean results?

JavaScript
1

Hey guys !

I would need your help here, I have 3 booleans associated with values, let’s say:

* Blue Car: true/false
* Red Car: true/false
* Black Car: true/false

Based on the boolean value (true = present), the output object should be:
params = ['BLUE_CAR','RED_CAR','BLACK_CAR']

For instance:

* Blue Car: false
* Red Car: true
* Black Car: true

params = ['RED_CAR','BLACK_CAR']

I was thinking about multiple ifs…but it doesn’t feel elegant.
Do you have a better idea ?

2

a filter method?

a loop?

thebest way depends in how you get the values

3

Thanks @ilenia for your response.

Well, that’s the issue I guess. The booleans are stored in this format:

* properties.bluecar
* properties.redcar
* properties.blackcar
4

so why not a for…in over the object?

for (let car in properties) {
   if (properties[car]) {
      ...
   }
}
5

I understand that the proposed code matches all variables with a car suffix in properties object and loop over these values, right ?

6

a for…in loop loops over all the properties

7

Yes.

Apologies, I have not seen specific enough, actually properties contains much more (which I don’t want in the output object) than only the car colors, :sweat_smile:, that’s why it makes value retrieval more challenging I guess.

8 
for (let car of ["bluecar", "redcar", "blackcar"]) {
   if (properties[car]) {
      ...
   }
}
9

Quick and dirty:

const params = []
properties.bluecar && params.push('BLUE_CAR')
properties.redcar && params.push('RED_CAR')
properties.blackcar && params.push('BLACK_CAR')
10